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给的是大概思路  你需要自己加东西的

      private void pictureBox1_MouseDown(object sender, MouseEventArgs e)

        {

            if (e.Button == MouseButtons.Left)

            {               

                IsDraw = true;

                StartPoint = new Point(e.X, e.Y);

            }

            else

            {

                Graphics g = this.pictureBox1.CreateGraphics();

                g.Clear(this.BackColor); 

            }

        }



        private void pictureBox1_MouseMove(object sender, MouseEventArgs e)

        {

            this.Text = string.Format("X:{0},Y:{1}", e.X, e.Y);